1、STD.ETSI TR 101 233-ENGL 1778 3900855 0273543 b7b TR 1 O1 233 1.1.1 (1998-02) Technical Repon Television systems; Code of practice for allocation of services in the Vertical Blanking Interval (VBI) STD-ETSI TR 101 233-ENGL 1778 3400855 0273544 502 2 TR 101 233 Vl.l.1 (1998-02) Reference DTWJTC-VBI (
2、bf000icS. PDF) Keywords Broadcasting, COP, TV, Teletext ETSI Secretariat Postai address F-06921 Sophia Antipoiis Cedex - FRANCE Office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture
3、de Grasse (06) No 7803/88 Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 X.400 c= fr; a=atlas; p=etsi; s=secretariat internet secretariat etsi.fr httpj/w.etsi.fr Cor, vriaht Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction
4、 extend to reproduction in ail media. O European Telecommunications Standards Institute 1998. O European Broadcasting Union 1998. All rights reserved. STD-ETSI TR 101 233-ENGL 1998 3900855 0273545 Li97 3 TR 101 233 V1.l.l (1998-02) Contents Intellectual Property Rights 4 Foreword 4 1 2 3 3.1 3.2 4 5
5、 5.1 5.1.1 5.1.2 5.1.3 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.3 5.3.1 5.3.2 5.3.3 5.3.4 6 7 7.1 7.1.1 7.1.2 Scope 5 References 5 Definitions and abbreviations 6 Definitions . 6 Abbreviations . 6 Generalities 7 Signals 7 Signais whose line number is specified 7 . 7 . 7 8 . 8 Test signals . 8 Encryption system
6、s . 8 9 Teletext-like data broadcasting 9 Non-Teletext data broadcasting 9 Vertical interval time code . . 9 Principles applied to the allocation of services to lines . 9 Allocation of Teletext services 10 . 10 11 Magazine parallel mode . 11 Ghost Cancellation Reference (GCR) Wide Screen Signalling
7、(WSS) Video Programming System (VPS) . Frequently used signals Quiet lines . . 8 Teletext broadcasting 9 Signals that are infrequently used . Closed captioning 9 Teletext text transmission Magazine serial mode . 7.1.2.1 Simple parallel operation . 11 7.1.2.2 Complex transmissions . 11 7.2 Data broad
8、casting 11 7.2.1 Page based 11 7.2.2 Independent 11 7.2.3 Audio data 12 7.3 Packet 8/30 format 1 12 7.4 Programme Delivery Control (PDC) 8/30f2 . 12 7.5 Allocation summary . 12 Annex A (informative): Annex B (informative) : Examples of VBI allocation . 14 Example of test signal construction . 15 His
9、tory 16 STD-ETSI TR 101 233-ENGL 1998 D 3q00855 027354b 385 4 TR 101 233 Vl.l.1 (1998-02) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
10、 ETSI members and non-members and can be found in ETR 3 14: “intellectual Property Rights IPRs); Essential, or potentially Essential, IPRs notified to ETSt in respect of ETSI standards“, which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSI Web server
11、(http:/www.etsi.fr/ipr). Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on http:/www.etsi.fr/ipr) which are, or may be, or may becom
12、e, essential to the present document. Foreword This Technical Report (TR) has been produced the Joint Technical Committee (JTC) of the European Broadcasting Union BU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The
13、EBUETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and t
14、elevision receivers. The EBU is a professional association of broadcasting organizations whose work includes the Co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcas
15、ting area; its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 71721 11 Fax: +41 22 717 24 81 STD ETSI TR 101 233-ENGL 1778 3400855 0273547 211 D 5 TR 101 233 Vl.l.1 (1998-02) 1 Scope The present document is intended as a companion docum
16、ent to ETS 300 706 i and ETS 300 708 2, covering the data format and transmission via Teletext. It is primarily aimed broadcasters and telecommunications network operators with the intention that there is a consistent approach to the positioning of services within the Vertical Blanking interval (VBI
17、) of 625150 Phase Alternation Line (PAL) derived services in Europe. The main area of interest is in the VBI as received at home, and thus the effects of all the telecommunication systems that are used to convey the signal are taken into account. Thus as there are many options available to all the p
18、arties involved in creating the total system, some common understanding of the concepts involved is required as well as formai agreements between parties for the use of the VBI. 2 References References may be made to: a) specific versions of publications (identified by date of publication, edition n
19、umber, version number, etc.), in which case, subsequent revisions to the referenced document do not apply; or b) all versions up to and including the identified version (identified by “up to and including“ before the version identity); or c) all versions subsequent to and including the identified ve
20、rsion (identified by “onwards“ following the version identity); or d) publications without mention of a specific version, in which case the latest version applies. A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. il ETS 300 70
21、6: “Enhanced Teletext specification“. 121 13 1 ETS 300 708: “Television systems; Data transmission within Teletext“. ETS 300 231: “Television systems; Specification of the domestic video Programme Delivery Control system (PDC)“. 41 51 i61 71 ETR 287: “Television systems; Code of practice for enhance
22、d Teletext“. ETR 288: “Television systems; Code of practice for an Electronic Programme Guide (EPG)“. ETS 300 294: “Television systems; 625-line television Wide Screen Signalling (WSS)“. ETS 300 732: “Television systems; Enhanced 625-line PAUSECAM television; Ghost Cancellation Reference (GCR) signa
23、ls“. ITU-R Recommendation 473: “Insertion test signals in the field blanking interval of monochrome and colour television signals“. i81 91 1101 ITU-R Recommendation 567: “Test signals for Television Systems“. EBU Recommendation R26-198 1 : “The use of Insertion -reference signals(IRS) in television
24、production installations“. STD=ETSI TR LOL 233-ENGL 1998 W 3400855 02735L18 158 W 6 TR 101 233 V1.l.l (1998-02) 3 3.1 Definitions and abbreviations Definit ions For the purposes of the present document, the following definitions apply: Data stream: A continuous sequence of related data. Decoder: A T
25、eletext decoder collects and decodes the transmitted Teletext data. It processes and stores the data and under user control selects the information for display. Decoders can differ in their storage capacity and display capability. Filler packets: Dummy packets inserted onto otherwise unused VBI line
26、s which exists as a result of obeying the 20 ms page clearing rule. Level 1, 1.5,2.5,3.5: Teletext presentation levels. 20 ms page clearing rule: This de defines the minimum interval between the transmission of the page header (row O) of a Teletext page and the transmission of the remaining packets.
27、 It is essential for some existing Teletext decoders to give them time to erase the old page from memory. Level 2.5 (and above) decoders can operate without such a delay being necessary. This is referred to as the 20 ms rule in ETS 300 707 i. 3.2 Abbreviations For the purposes of the present documen
28、t, the following abbreviations apply: CNI CVBS EACEM EPG FBI GCR ITS LCI NTSC PAL PDC SECAM TV UTC VBI VCR VlTC VPS wss Country and Network Identification code Composite Video, Blanking and Synchs European Association of Consumer Electronic Manufacturers Electronic Programme Guide Field Blanking Int
29、erval Ghost Cancel Reference Insertion Test Signal(s) Label Channel Indentifier National Television Standards Committee (TV standard) Phase Alternation Line (colour TV system) Programme Delivery Control SequentiellE Couleur Avec Mmoire (French colour TV system) Television Universal Time Co-ordinated
30、 Vertical Blanking Interval Video Cassette Recorder Vertical Interval Time-Code Video Programming System Wide Screen Signalling 7 TR 101 233 Vl.l.1 (1998-02) 4 G en eral it es The television Vertical Blanking interval (VBI), also known as the Field Blanking Interval (FBI) consists of the TV lines 62
31、3 to 22 in field one and 31 1 to 335 in field two. By convention, there is an association between a line in field one and the line in field two 313 lines later. So the complement of line 6 is 319 and the line pair of line 6 and 319 is referred to as 6/319. 4 field.blan king Inlerval (25 lines) possi
32、bleTeleteutData-Lines (Vel) b 4 Multiplexed Mode :; .I nnnnmuuuu 622 j i! riluuu 310 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 Figure 1: Usable TV lines, when multiplexed with a CVBS signal ETS 300 706 i permits the operation of Teletext signals on lines 6/319 to 22/335
33、 plus line 318. Broadcasters, regulatory authorities and the common carriers of information such as public telecommunications operators, cable and satellite operators may use lines in this range for a variety of purposes such as: a) test signals; b) quiet lines: c) encryption systems; d) Teletext ba
34、sed signals; e) non-Teletext based data broadcasting; f) closed caption text services. The present document indicates where these signals may be located and points out the basis on which services are allocated to VBI lines. This may vary from country to country. 5 Signals 5.1 Signals whose line numb
35、er is specified 5.1.1 Ghost Cancellation Reference (GCR) This waveform to U-R BT 1124 Systems C and ETS 300 732 7 is camed on line 318. 5.1.2 Wide Screen Signalling (WSS) As this is carried on the first half of line 23, it does not fall within the strict definition of the VBI. This signal to ETS 300
36、 294 6 occupies only the first half of the line the remainder being active picture. STD-ETSI TR 101 233-ENGL 1798 3400855 0273550 Bob 8 TR 101 233 Vl.l.1 (1998-02) 5.1.3 Video Programming System (VPS) This is a bi-phase modulation with a data rate of 2,5 Mbit/s on line 16 used for the record functio
37、n of some Programme Delivery Control (PDC) systems (see ETS 300 23 1 3). 5.2 Frequently used signals 5.2.1 Test signals The standard test signals used by broadcasters are based on KU-R Recommendation 473 8 and ITU-R Recommendation 567 9 which describe many elements of test signals. There is also EBU
38、 Recommendation R 26-1981 lo which recommends the use of ITU-R Recommendation 473 8. These standard test signals are generally repetitive on the two fields and are often on lines 171330, 181331 and 191332 or 191332 and 201333. The elements of these waveforms usually include: a) luminance bar at 100
39、%; b) 2Tpulse; c) T pulse or 20T pulse; d) chrominance bar on a luminance pedestal; e) luminance steplstair case: f) luminance step/stair case with superimposed chrominance; g) luminance saw-tooth, h) luminance saw-tooth with superimposed chrominance; i) colourbars. In addition there are test signal
40、s which include a frequency sweep and a (sin x)/x waveform. These waveforms are used to assess the quality of the transmitted signal. Action can be taken automatically for instance to adjust the equalization of a radio link or rebroadcast signal or to change over to a standby feed. As such, these si
41、gnals are very important to the broadcaster or public telecommunications operator and often test signals will be constructed to meet specific needs. It is desirable that any new signals are constructed and transmitted to have no effect on Teletext decoders. This may be achieved by ensuring that ther
42、e is no pm of the waveform which a Teletext decoder may interpret as valid Teletext framing code in the presence of noise. It should be noted that some existing decoders will accept a single bit error in the framing code and have a framing code acceptance window which is considerably wider than the
43、transmission limits defined in the present document. 5.2.2 Quiet lines The measurement of random noise by receivers and by public telecommunications operators and broadcasters is normally made on a quiet line. As many existing Teletext decoders cannot decode line 6/319, one or both of these lines is
44、 often used for noise measurement. 5.2.3 Encryption systems Many broadcasters encrypt their signals and the control of the decrypting systems is canied in the unencrypted VBI. These systems which are entirely proprietary, can occupy a number of VBI line pairs. For example Videocrypt can be interpret
45、ed as valid Teletext by some existing decoders under some circumstances, resulting in corrupted displays. STD-ETSI TR LIIL 233-ENGL 1998 3q00855 0273553 742 I TR 101 233 V1.l.l (1998-02) 9 5.2.4 Teletext broadcasting This is packet based broadcasting that conforms to ETS 300 706 i or ETS 300 708 2.
46、Teletext decoders should be designed to be insensitive to non-Teletext waveforms. It is reasonable to assume that on a given channel the type of waveform on a given line will remain constant for one session of viewing. 5.3 Signals that are infrequently used 5.3.1 Teletext-like data broadcasting Cert
47、ain forms of data broadcasting and other private data can be camed by a Teletext based waveform that does not fully comply to ETS 300 706 i or ETS 300 708 2. This can be generated by using a different framing code or inverting the data. 5.3.2 No n-tel et ext data b road cast i ng There are a number
48、of proprietary data broadcasting systems which do not use a Teletext - like waveform. 5.3.3 Closed captioning This is a derivative of the closed caption system to EIA 608 (Line 21 Data services for NTSC) used in North Amenca on line 21/334. In Europe this signal is used for internal purposes by some
49、 satellite broadcasters, not for general reception in the home, usually on line 22/335. This is also known as NCI (National Captioning Institute) caption. 5.3.4 Vertical interval time code Broadcasters may inadvertently broadcast this internal signal which is recorded on video tape on lines 19/332 and 21/334. This may occur because the picture has been processed and has slipped by a few lines. In some counties lines 9/322 and lines 22/335 are used for this purpose. 6 Principles applied to the allocation of services to lines The broadcas
